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Same here - multitude of bugs I have never seen before in this game.
About the performance... dude, i was able to play this game on FullHD, medium-high settings on a GTX 960m +6700HQ laptop before the update in When will Subnautica be fixed?Comment by sigmund1410March 2020
In case anyone still have this problem, my solution was to uninstall the latest Game Ready driver (nvidia card), and install the latest Studio driver. No more access violation errors.